Não informado. (1938). The American Biology Teacher. National Association of Biology Teachers.
Lua i Stíl Chicago (17ú heag.)Não informado. The American Biology Teacher. Reston, Va: National Association of Biology Teachers, 1938.
Lua MLA (8ú heag.)Não informado. The American Biology Teacher. National Association of Biology Teachers, 1938.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.